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authorRoel Kluin <roel.kluin@gmail.com>2009-02-12 16:52:31 -0800
committerDavid S. Miller <davem@davemloft.net>2009-02-12 16:52:31 -0800
commit501aa061bd68169a5b54c123641f8dfa9ad31545 (patch)
treec3824d1b8e3085566748b29fbfd9186d916119a3 /drivers/net/3c505.c
parentf82da723398ff18d49275a5f03de6cae5f592e8e (diff)
downloadop-kernel-dev-501aa061bd68169a5b54c123641f8dfa9ad31545.zip
op-kernel-dev-501aa061bd68169a5b54c123641f8dfa9ad31545.tar.gz
3c505: do not set pcb->data.raw beyond its size
Ensure that we do not set pcb->data.raw beyond its size, print an error message and return false if we attempt to. A timout message was printed one too early. Signed-off-by: Roel Kluin <roel.kluin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/3c505.c')
-rw-r--r--drivers/net/3c505.c26
1 files changed, 16 insertions, 10 deletions
diff --git a/drivers/net/3c505.c b/drivers/net/3c505.c
index 6124605..a8107f9 100644
--- a/drivers/net/3c505.c
+++ b/drivers/net/3c505.c
@@ -493,21 +493,27 @@ static bool receive_pcb(struct net_device *dev, pcb_struct * pcb)
}
/* read the data */
spin_lock_irqsave(&adapter->lock, flags);
- i = 0;
- do {
- j = 0;
- while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && j++ < 20000);
- pcb->data.raw[i++] = inb_command(dev->base_addr);
- if (i > MAX_PCB_DATA)
- INVALID_PCB_MSG(i);
- } while ((stat & ASF_PCB_MASK) != ASF_PCB_END && j < 20000);
+ for (i = 0; i < MAX_PCB_DATA; i++) {
+ for (j = 0; j < 20000; j++) {
+ stat = get_status(dev->base_addr);
+ if (stat & ACRF)
+ break;
+ }
+ pcb->data.raw[i] = inb_command(dev->base_addr);
+ if ((stat & ASF_PCB_MASK) == ASF_PCB_END || j >= 20000)
+ break;
+ }
spin_unlock_irqrestore(&adapter->lock, flags);
+ if (i >= MAX_PCB_DATA) {
+ INVALID_PCB_MSG(i);
+ return false;
+ }
if (j >= 20000) {
TIMEOUT_MSG(__LINE__);
return false;
}
- /* woops, the last "data" byte was really the length! */
- total_length = pcb->data.raw[--i];
+ /* the last "data" byte was really the length! */
+ total_length = pcb->data.raw[i];
/* safety check total length vs data length */
if (total_length != (pcb->length + 2)) {
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